Urgent: Tier 2 Application refusal, U-COS and Re-Application

[siolog]

Hello,
I must say this website has been of a very big help. Thank you so much who ever came up with this idea.
But I do have question that needs urgent reply:

I applied for my Tier 2 General Visa Extension on 13/10/2016.
While my current leave was due to expire 12/11/2016 But it was refused on 02/12/2016 due to low salary.
I was given an option for administrative review within 14 days. But my company decided to up my salary and that I should re-apply. Now the main issue is that a new Unrestricted COS increase was requested because they had none left for me to use.
My questions:
- Are there any chances for a successful re-application been that my current leave has expired during initial application?
- How long does it take for Unrestricted COS allocation increase? Looking at my 14 days deadline for administrative review or can I be considered for a fast track urgent COS allocation increase?
- If COS application is granted can I use my previously refused application health surcharge for my new application? Or pay a separate for a one?
Please I need your urgent input as I wouldn't want to abuse the immigration system being an overstayer.
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